This is a discussion on Cannot access site... within the Chrome Troubleshooting section, part of the Google Chrome category: ... which is using some kind of certificate:
https://dukath-www.rz.uni-karlsruhe.de/
it works in Firefox/IE....
Any suggestions are welcomed!
Thanks...

If you have any user scripts or extensions installed you might want to remove them, or use the "--user-data-dir=" command-line switch to temporarily point to a new folder for a clean setup.

I have seen several user scripts and extensions mess me up on various sites, and it is something that changes with each release of Chrome. It can come in handy to setup an alternate Chrome ICON that launches using a different user data folder. Then you can always test with/without whatever your default setup has installed.